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Graphene for the Building of Electroanalytical Enzyme-Based Biosensors. Application to the Inhibitory Detection of Emerging Pollutants.
Nanomaterials (Basel)
August 2021
Sensors and Biosensors Group, Department of Chemistry, Universitat Autònoma de Barcelona, Edifici CN, 08193 Bellaterra, Spain.
Graphene and its derivates offer a wide range of possibilities in the electroanalysis field, mainly owing to their biocompatibility, low-cost, and easy tuning. This work reports the development of an enzymatic biosensor using reduced graphene oxide (RGO) as a key nanomaterial for the detection of contaminants of emerging concern (CECs). RGO was obtained from the electrochemical reduction of graphene oxide (GO), an intermediate previously synthesized in the laboratory by a wet chemistry top-down approach.
View Article and Find Full Text PDFElectrochemical determination of T toxin by graphite/polyacrylonitrile nanofiber electrode.
Food Sci Nutr
February 2021
Fabricating graphite electrode corrected with nanofiber by electrospinning as a considerable procedure for utilization in the fluid materials, milk, and syrup for detection of T mycotoxin is a significant technique. The modern biosensor was fabricated at normal degrees of room and utilized via buffer Britton-Robinson (B-R) in pH = 5 to refine the chemico-mechanical specifications. The electrochemical manner of the modified surface was surveyed using the scanning electron microscopy (SEM), cyclic voltammetry (CV), square wave voltammetry (SQWV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV).
View Article and Find Full Text PDFSample preparation combined with electroanalysis to improve simultaneous determination of antibiotics in animal derived food samples.
Food Chem
June 2018
Faculty of Science and Technology, Federal University of Grande Dourados, Rodovia Dourados- Itahum, km 12, Dourados, MS 79804-970, Brazil; Unesp, National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM), Institute of Chemistry, P.O. Box 355, 14800-900 Araraquara, SP, Brazil. Electronic address:
A procedure based on liquid-liquid extraction (LLE) and phase separation using magnetically stirred salt-induced high-temperature liquid-liquid extraction (PS-MSSI-HT-LLE) was developed to extract and pre-concentrate ciprofloxacin (CIPRO) and enrofloxacin (ENRO) from animal food samples before electroanalysis. Firstly, simple LLE was used to extract the fluoroquinolones (FQs) from animal food samples, in which dilution was performed to reduce interference effects to below a tolerable threshold. Then, adapted PS-MSSI-HT-LLE protocols allowed re-extraction and further pre-concentration of target analytes in the diluted acid samples for simultaneous electrochemical quantification at low concentration levels.
View Article and Find Full Text PDFBaseline-Corrected Second-Order Derivative Electroanalysis Combined With Ultrasound-Assisted Liquid-Liquid Microextraction: Simultaneous Quantification of Fluoroquinolones at Low Levels.
Anal Chem
June 2016
Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados , Rodovia Dourados-Itahum, km 12, Dourados-MS, 79804-970, Brazil.
A baseline-corrected second-order derivative procedure and a miniaturized sample preparation based on low-density solvent and ultrasound-assisted liquid-liquid microextraction (LDS-UA-LLME) was combined to provide the simultaneous electroanalysis of three fluoroquinolones (FQ) as emerging contaminants (ECs). The enhanced mathematical processing provided the best separation with an accurate measurement of the overlapping peaks during the simultaneous electro-oxidation of target FQs that were directly dropped on the surface of carbon nanofiber-modified screen-printed electrodes. The adapted LDS-UA-LLME protocol was the key step involved in the sample preparation, which preconcentrate target analytes from diluted tap water samples with an enrichment factor of around 80×, allowing their quantification at trace levels.
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